The late season (November 1 to Jan 31st) is a doe/fawn only hunt, so don’t have to worry about horns really. Just black cheek patches... Plenty of ground to cover. I would think the later you plan to go the more likely your access will be limited by snow. So weather dependent you may need a set of cross country skis.
The area isn’t the whole North Sioux rifle unit, it’s a stretch of highway 20 from Chadron to Crawford and you can hunt 6 miles on each side. Plenty of lopes, you just have to ask permission since it’s mostly private.
I’ve done the Regular rifle season Twice with success both times. Decent amount of goats. Hoping to connect on one in the grasslands with the bow early next month